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Abstracts: To investigate the functional characteristics of low-temperature tolerance-related NAC transcription factors in wheat, a low-temperature-tolerant variety Mazhamai and a low-temperature-sensitive variety Jimai 22 were used for transcriptome sequencing, and 31 candidate NAC transcription factors potentially associated with low-temperature tolerance were screened. Bioinformatics analysis showed that 12 of the TaNAC proteins are basic proteins (pI>7), while the others are acidic proteins (pI<7). All proteins are hydrophilic and mainly localized in the nucleus. The secondary structure was dominated by random coils. Collinearity analysis revealed that there were extensive collinear relationships between NAC transcription factors in wheat and rice. Promoter analysis indicated that the promoter regions of these NAC transcription factor genes contained various cis-acting elements involved in stress responses and hormone signaling, among which TaNAC048-A1 harbored the most abundant regulatory elements. Under low-temperature stress, the expression levels of TaNAC048-D1,TaNAC048-A1,TaNAC015-B4,TaNAC039-D1,TaNAC104-D2,TaNAC048-B1,TaNAC001-B1, and TaNAC001-A1 were significantly up-regulated in Mazhamai. In Jimai 22, TaNAC048-D1, TaNAC039-D1, and TaNAC104-D2 were significantly up-regulated, while TaNAC048-B1 was significantly down-regulated, and the remaining four genes showed no significant changes. The transcriptome sequencing data were verified by qRTPCR. These TaNAC transcription factor genes may play important roles in the response of wheat to low-temperature stress.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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